Sight for lubricators.



No. 792,765. PATENTED JUNE 20. 1905.

P. W. EDWARDS.

SIGHT FOR LUBRIGATORS.

APPLICATION FILED JAN, 4, 1905.

Wv'lrcesses: m I

UNITED STATES Patented June 20, 1905.

PATENT OEEIcE.

FRANK WV. EDWARDS, OF LOGANSPORT, INDIANA, ASSIGNOR TO THE CHICAGOLUBRICATOR COMPANY, OF CHICAGO, ILLINOIS, A COR- PORATION OF ILLINOIS.

SIGHT FOR LUBRICATORS.

SPECIFICATION forming part of Letters Patent No. 792,765, dated June 20,1905.

Application filed January 4, 1905. Serial No. 239,652.

To rtllwulmm it may concern:

Be it known that I, FRANK W. EDWARDS, a citizen of the United States,residing at Logansport, in the county of Cass and State of Indiana, haveinvented a certain new and useful Improvement in Sights for Lubricators,of which the following is a full, clear, and exact description.

This invention relates to that class of sights for sight-feedcondensation-displaeement lubricators, particularly such as are used onlocomotives, wherein instead of a glass tube there are used solid disksor panes of glass; and the invention consists of means for readil yinserting the glasses and holding them in place in a fluid-tight mannerand so that they may be easily and conveniently removed or replaced.

In the accompanying drawings, illustrating the invention, in the severalfigures of which like parts are similarly designated, Figure 1 is alongitudinal section and partial elevation of one form of the invention.Fig. 2 is a similar view of another form. Fig. 3 is an end viewapplicable to both forms. Figs. 4, 5, and. 6 are longitudinal sectionsof three several modifications of the means for securing the glasses inthe casing, the nut and gasket in Fig. 5 being shown in part inelevation. Fig. 7 is a longitudinal section of another modification.

Any suitable form and configuration of easing 1 to receiveappropriately-shaped solid glasses and to constitute the water-chambermay be employed; but simply for illustration this specificationdescribes a cylindrical casing and glasses. The casing is made with anipple 2 to receive the oil-feeding tip 3 and controlling-valve 4 andalso with a deliverynipple 5. Shoulders 6 are provided, against whichthe glasses 7 are placed. As shown in Fig. 1, these glasses are providedon one face with circular grooves 8 to receive the footflanges 9 ofsleeves 10, which support and center the gaskets 11, of suitable packingmaterial, and the grooves are of a depth at least equal to the thicknessof the foot-flanges 9, so that the gaskets may come flush against thefaces of the glasses, and thereby form a fluid-tight joint when forcedor compressed into place by the nuts 12. The base'13 of each nut is soformed, as by a flange, as to be equal in width to the gasket, so thatwhen turned up tight the gasket will be confined between the casing andthe sleeve, the gasket pressing the foot-flange of the sleeve againstthe glass or into its groove, and thereby the gasket will be preventedfrom spreading over the observation portion of the glass.

As shown in Fig. 2, the grooves may be omitted and the glass disks 14 bemade plain.

As shown in Fig. 4, the outer ends of the sleeves 15 may be expanded,and thus swiveled within the nuts, so that in withdrawing the nuts thesleeves and gaskets will be drawn out also.

As shown in Fig. 5, the sleeve 16 may be an integral part of the nut 17,and in that case the gasket 18 may be cut through, as at 19, so as to bereadily sprung over the foot-flange onto the sleeve. When the sleeve 16is made an integral part of the nut 17 the recess or groove in the glassis made of a depth sulfieient to allow the compression of the gasket.The foot-flange on the sleeve will retain the gasket in place and willbe the means of withdrawing the gasket and preventing part of saidgasket from spreading over the end of the sleeve.

As shown in Fig. 6, a gland or washer 20, of thin metal, may beinterposed between the nut and gasket, so as to relieve friction betweenthe nut and gasket in turning the nut in and out.

As shown in Fig. 7, the expanded sleeve of Fig. 4 and the washer 20 ofFig. 6 may be combined for use in connection with a glass having agroove to receive the foot-flange.

It will be understood that the nuts are preferably cylindrical andscrew-threaded externally to engage internal screw-threads in the endsof the casing, as clearly shown.

The metal sleeve is of less diameter than the glass, so as to bring theelastic packing-ring within the diameter of the glass and prevent itfrom spreading over the glass when expanded under the compression of thenut, thus preventing the packing from encroaching on the field ofvision.

The use of the groove in the disk is advantageous in that the gasket mayfit flush against the glass and the foot-flange, and thus a perfect sealinsured.

Glasses of any thickness may be used.

By the several constructions described a very simple and eflicient meansis provided for readily inserting and removing the glasses, so that incase of breakage of any glass the engineer may quickly replace itwithout throwing the feed out of service for any great length of time.It is to be noted of these several constructions that a fullbearing-face of the gasket comes squarely against the glass, andsimilarly the nut has its contact with the gasket, or, in other words,the planes of pressure or resistance are parallel, and hence the maximumefficiency of the gasket is available.

Gaskets of any symmetrical cross-section 'may be used, and while thesquare cross-section is shown the invention is not limited thereto.

That I claim is* 1. A sight for lubricators, having a casing, a glasstherein, a gasket, a sleeve supporting the gasket next the face of theglass, and a nut encircling the sleeve and in contact with the gasket.

2. A sight for lubricators, having a casing, a glass therein, a gasket,a sleeve havinga footflange and supporting the gasket next the face ofthe glass, and a nut encircling the sleeve and in contact with thegasket.

3. A sight for lubricators, having a casing, a glass therein, providedwith a circular groove in its face to receive the foot-flange of thesleeve, a gasket, a sleeve having a foot-flange and supporting thegasket next the face of the glass, and a nut encircling the sleeve andin contact with the gasket.

4. A sight for lubricators, having a casing, a glass therein, a gasket,a sleeve supporting the gasket next the face of the glass and having afoot-flange, and a nut encircling the sleeve and in contact with thegasket, said sleeve expanded in the nut and removable with it.

5. A sight for lubricators, comprising a casing, a glass therein, agasket, a washer next said gasket, a sleeve upon which the gasket andwasher are mounted, and a nut encircling the sleeve and engaging thecasing and adapted to be turned up against the washer and thereby forcethe gasket into fluid-tight engagement with the face of the glass, thesleeve meanwhile preventing the gasket from obtruding in the field ofvision.

6. A sight for lubricators, having an internally-shouldered casing,glasses arranged in said casing against its shoulders, gaskets arrangednext the faces of said glasses, sleeves encircled by said gaskets, andnuts encircling the sleeves and adapted to compress the gaskets againstthe glasses.

7. A sight for lubricators, having an internally-shouldered andscrew-threaded casing, a glass arranged in said casing against itsshoulder, a gasket arranged next the face of the glass, a sleeveencircled by said gasket and a nut encircling the sleeve and engagingthe screwthreads in the casing and adapted to force the gasket againstthe glass and secure the glass in the casing in a fluid-tight andreadily-removable manner.

In testimony whereof I have hereunto set my hand this 2d day of January,A. D. 1905.

FRANK W. EDWARDS.

Witnesses:

F. H. WIPIERMAN, JOSEPH G. LONG.

